2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 141Get this manual
Drive shaft and lower case 3Install new O-ring onto the oil seal housing 64Install new gasket 7, the oil seal housing 6, new gasket 8, the outer plate cartridge 9, and new gasket 0 e d
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NOTE: Align the insert cartridge projection with the hole in the water pump housing8Install the dowels E, and the water pump housing onto the lower case9Install and tighten the bolts F
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5Install the Woodruff key into the drive shaft6Align the groove on the impeller with the Woodruff key B, and then install the impeller onto the drive shaft